| Comp Ratio base
on: |
.042 head gasket,
lower comp=flat top "down in hole" |
| Block Height: |
9.790 |
| Forced Induction: |
Yes |
| Nitrous: |
Yes |
| Pins: |
.990 dia. x 2.930 lgth x .150 wall |
| Ring Grooves: |
5/64, 5/64, 3/16 |
| Tech Tip: |
Street, Marine, Drag
(Use taper bore pins in higher HP apps) |
|
Chevy Big Block
Open or Closed Chamber BLOWN
Includes: Pistons, Pins, Spiro Lox
- ROSS pistons listed in this section are designed for blown and turbo charged engines, and have thicker ring lands, more massive pin bosses and larger internal radii to withstand the additional cylinder pressure that forced induction engines put out.
- Ideal for street and marine applications, as well as drag racing.
- Pins included are .990 dia., 2.930 length, .150 wall, 149 gram weight, aircraft quality, and are retained by double spiro lox or can be press fitted in rods.
- In extremely high HP applications, Ross taper bore pins (part #990-04-29) are recommended.
- Ring grooves are 5/64, 5/64, 3/16, except for part #'s 85065 and 85365 which utilizes 1/16, 1/16, 3/16 rings.
- Lower compression ratio is achieved by utilizing more deck clearance than normal (flat top "down in the hole").
- Compression ratio based on 9.790 block height (stock block milled at .010), with .042 head gasket.
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